Display device having signal lamps

Details Display device having signal lamps Display device having signal lamps

1974-10-29

1976-04-20

Kominski, John

Electric lamp and discharge devices: systems

With signal, indicator, or alarm

Plural load device systems

315135, 324 21, 340251, G08B 2100

Patent

active

039522296

ABSTRACT:
In a display device having a plurality of signal lamps, each lamp is coupled to a signal contact through a first decoupling diode and a test voltage having a voltage lower than that of the signal voltage is coupled to each lamp by means of a series resistance and second diode to generate a current acting both to pre-heat the lamp and for use in indicating lamp failure with a further diode coupled to the second diode providing an input to testing means giving an indication of a lamp failure.

REFERENCES:
patent: 3631393 (1971-12-01), Bennett
patent: 3643247 (1972-02-01), Ratcliffe
patent: 3706983 (1972-12-01), Olsen et al.
patent: 3719937 (1973-03-01), Doyle
patent: 3745547 (1973-07-01), Hadank
patent: 3825914 (1974-07-01), Schacket

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